Veteran rocker Brian May is to check in to a hospital to undergo knee surgery on Tuesday (06Aug13). The Queen star recently revealed he has been having trouble with a chronic knee problem and voiced fears he may have to undergo an operation to fix the issue. May has now confirmed he has jetted back from a sunshine break on the Spanish island of Tenerife so he can have knee replacement surgery on Tuesday. In a series of posts on his Twitter.com page, he writes, "Just home from an insane trip to a place close to heaven to clear my head before my knee op tomorrow... Thanks for the good luck messages. I go in 6.30am tomorrow for knee replacement."